FBO advance limiter plate

[440beep]

I’m considering getting a FBO advance limiter plate for my MP dizzy, and while doing research here, I’ve seen mixed results about the plates. Seen a few posts about the plate not being 100% accurate. Trying to figure out if there’s more positives than negatives for this limiting plate.

Currently I use the MP plastic keys to set the advance plates, so could just stay with that.

 

[Kern Dog]

See this thread.

What is your timing curve?

The MP distributor was replaced with a better unit and I used the FBO plate in question.

 

[rmchrgr]

I've used them without issue several times. They are a good thing since IMO you generally want as much initial timing as your combo can use while still being able to limit the total advance. Not sure how anyone would have had a negative experience with it, kind of makes no sense.

Not sure how the plates would be inaccurate either since they are CNC machined but you can always measure the slots to check them. I can't find it in my files now but there used to be a chart floating around that showed how much advance certain slot lengths provide. It might be in one of the old MP books somewhere too since that's where tht info originally came from.

That said, how accurate could it have been to weld the slots on the factory T bar and file them to XYZ length? Not really precise methodology there either but again that idea came from Ma Mopar. THe plates eliminate all that BS which is a good thing.

 

[turbine68rt]

Used them in several cars, for mine as well as for friends with no issues. The ease of simply selecting which slots work best for you is a plus.

 

[440beep]

So back to this issue. Is the limiter plate only meant to be used with an original Mopar dizzy and NOT the MP electronic dizzy? Are the two different internally, because here’s a photo of the dizzy plate that won’t go over the dizzy shaft plus the mounting holes sit out wider than the MP electronic dizzy.

 

[440beep]

My bad, that gold colored assembly comes off. But the plate still doesn’t fit, mounting holes are too wide for the MP electronic dizzy.

 

[turbine68rt]

Not meant to use with that style distributor, but with an oem Chrysler points or electronic unit.

 

[440beep]

What’s an electronic unit? Like a Firecore and not the MP Electronic conversion dizzy?

 

[turbine68rt]

A factory installed distributor that took the place of points style distributors since the early '70's.

 

[Crackedback]

Your distributor has a mallory style advance set up. It's set with the air gap from the plate and the upward pointing tabs in the window. You can set it with keys or use a drill bit shank of appropriate sizing (hillbilly approach as I never buy those keys).

Those plates don't work with the MP/DC electronic units. If the rotor shaft has a bronze color, it is a no go on them working.

It's for one that look like this.

 

[440beep]

CB, thanks for clear cut explanation. Now I get it.

Are dizzys like your picture available, or is it just a points dizzy with electronic conversion?

 

[Crackedback]

Available as in new... not sure. I bet you could find one at a napa or rock auto, etc.
It going to be a distributor out or a 73+ mopar with electronic ignition. Up until that disaster lean burn stuff... LOL